Facing performance issue after upgrading database from 12.1.0.2 to 19C with Ebusiness suite 12.2

Scenario :

Facing performance issue after upgrading database from 12.1.0.2 to 19C with Ebusiness suite 12.2

Analysis :

While analyzing we came across the parameter “_lm_res_hash_bucket” which inturn mentioned for a bug.

Solution:

But according to the following note id(Oracle), We cannot add any hidden parameters unless advised by Oracle.

NOTE 396009.1 – Database Initialization Parameters for Oracle E-Business Suite Release 12